Liam Revell wrote:
> > Poaching Intensity = beta0 + beta1*Body Size + e
>
> I think it depends on how the residual error in the model is
> distributed (esp. correlated) among species. It seems possible to
> invent hypothetical scenarios (as I did in my previous email) about
> how the resid
Hi David.
> Poaching Intensity = beta0 + beta1*Body Size + e
I think it depends on how the residual error in the model is distributed
(esp. correlated) among species. It seems possible to invent
hypothetical scenarios (as I did in my previous email) about how the
residual error in poaching i
ember 14, 2011 12:54 PM
To: Liam J. Revell; Joe Felsenstein; pasquale.r...@libero.it
Cc: R Sig Phylo Listserv
Subject: Re: [R-sig-phylo] Comparative Methods and Pseudo-Traits
Liam, Joe, Pasquale, all-
Thank you for your kind input.It seems that I am not the only one who
considers this issue at l
Liam, Joe, Pasquale, all-
Thank you for your kind input.It seems that I am not the only one who
considers this issue at length.
There is just one point I'd like clarification of. Liam, in my first
example which you used, the inherited trait is the response and the
not-directly-inheritable trait t
Liam wrote:
> I'm not sure I entirely agree that we need to assume that the environmental
> trait is evolving on the tree by Brownian motion. I believe that so long as
> Y|X (in David's example, growth rate given habitat degradation) is evolving
> by Brownian motion, we should be OK to use PIC
Hi Joe, David.
I'm not sure I entirely agree that we need to assume that the
environmental trait is evolving on the tree by Brownian motion. I
believe that so long as Y|X (in David's example, growth rate given
habitat degradation) is evolving by Brownian motion, we should be OK to
use PIC re
David Bapst wrote --
> Let's say that there exists a worker who is measuring several different
> traits across a number of species and then testing for correlations among
> these traits. The first test is body size versus growth rate and they use
> independent contrasts or PGLS to test for a the
Hi David.
In general it is inconsequential whether X or Y are biologically
inherited traits; but whether the residual error in Y given X is
correlated or independent among species. In the case of "growth rate as
a function of habitat degradation" this corresponds to:
Growth Rate = beta0 + b
Hello all,
A recent discussion set my mind thinking on a particular issue and, once
again, I decided to ask for the general opinion of R-Sig-Phylo denizens. It
may be easier to start with an example.
Let's say that there exists a worker who is measuring several different
traits across a number of
